AD1881A is a 48-lead LQFP package analog I/O component produced by Analog Devices. It supports the AC’97 2.1 standard and has a 16-bit stereo full-duplex codec function that can be connected to LIN, CD, AUX, MIC1, MIC2 and other devices, supporting variable sampling rate and true line-level output.
The AD1881A is an AC’97 2.1 audio codec featuring a 16‑bit stereo full‑duplex converter, multiple line‑level inputs, and a programmable mixer. It supports variable sample rates from 8 kHz to 48 kHz with 1 Hz resolution and includes PHAT™ stereo enhancement.
The document lists detailed electrical specifications, absolute maximum ratings, pin assignments, timing parameters, and recommended power‑supply layouts. Mechanical dimensions for the 48‑lead LQFP package are also provided.
| Maximum Sample Rate | 48 kHz |
|---|---|
| Resolution (ADC) | 16 Bits |
| Resolution (DAC) | 1 Bit |
| Analog Supply Voltage | 5.0 V |
| Digital Supply Voltage | 3.3 V |
| Input Impedance | 20 kΩ |
| Full‑Scale Output Voltage | 1 V rms |
| BIT_CLK Frequency | 12.288 MHz |
| Package Type | 48‑Lead LQFP |
The AD1881A supports up to 48 kHz sampling rate with 1 Hz resolution.
The input impedance is specified as 20 kΩ.